(19)
(11) EP 0 373 819 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.10.1990 Bulletin 1990/42

(43) Date of publication A2:
20.06.1990 Bulletin 1990/25

(21) Application number: 89312689.6

(22) Date of filing: 06.12.1989
(51) International Patent Classification (IPC)5: H01M 10/40, H01M 10/42, H01M 4/50
(84) Designated Contracting States:
DE FR IT

(30) Priority: 14.12.1988 GB 8829118

(71) Applicant: UNITED KINGDOM ATOMIC ENERGY AUTHORITY
London SW1Y 4QP (GB)

(72) Inventors:
  • Neat, Robin John
    Kennington Oxford (GB)
  • Powell, Raymond John
    Shaw Newbury (GB)

(74) Representative: Mansfield, Peter Turquand et al
United Kingdom Atomic Energy Authority Patents Department Building 329 Harwell Laboratory
Oxfordshire, OX11 0RA
Oxfordshire, OX11 0RA (GB)


(56) References cited: : 
   
       


    (54) Electrochemical cell manufacture


    (57) A secondary electrochemical cell is made by

    (i) assembling a solid state electrochemical cell having an anode containing an alkali metal such as lithium as active anode material; a solid alkali metal ion conducting electrolyte, for example a polymer electrolyte comprising a complex of a solid polymer (eg poly(ethylene oxide)) and an alkali metal salt (eg LiClO₄), which polymer is capable of forming donor-acceptor type bonds with alkali metal ions; and a cathode containing manganese(IV) oxide as active cathode material; and

    (ii) discharging the cell under conditions, eg of elevated temperature, such that the cathode material is transformed in situ into a rechargeable cathode material which may, for example be LiMn₂O₄.







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